I understand that this is a difficult situation for you. when a relationship comes to an end it causes a lot of emotional pain and hurt. There are times, like you mentioned when there is no apparent problem in the relationship but your goals are different. Often discussing about the situation with a trusted adult or a counselor would be helpful. Talk to a friend about it. Write about it. The idea is to vent out all the negative energy, anger, sadness from your system. I know its a tough time but it will pass and would be for good. Take care of your sleep, diet and well-being. I would request you to consult a psychologist as soon as possible for a session. If you are having thoughts of self- harm. Consult a counsellor / helpline numbers immediately. Take care.